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Contains:  IC 4601, IC 4592, The star χOph, The star ψOph, The star νSco, The star ω2Sco, The star ω1Sco, The star β2Sco, The star Graffias (β1Sco)
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The Blue Horsehead Nebula - IC 4592, 





    
        

            Gabriel R. Santos...
The Blue Horsehead Nebula - IC 4592

The Blue Horsehead Nebula - IC 4592

Technical card

Resolution: 1400x926

Dates:July 23, 2014

Frames: 30x60" ISO1600

Integration: 0.5 hours

Darks: ~5

Avg. Moon age: 26.40 days

Avg. Moon phase: 10.70%

Temperature: 6.80

Astrometry.net job: 547019

RA center: 244.163 degrees

DEC center: -19.365 degrees

Orientation: 6.965 degrees

Field radius: 3.891 degrees

Description

My image of this faint Nebula, the Blue Horsehead, or IC 4592. It is actually in the Scoripus (Scorpion) Constellation, near the bright Star Acrab (Magnintude 2.6). IC 4592 is, however, much fainter. It was barely visible in my subs (single frames), and i had to really stretch the image to show this blue nebulosity. It is surrounded by many dark nebulae, and dust. There is, actually, much more Dust in there, than what is visible in this picture.

I am, however, extremely satisfied with this picture. I can actually see the Blue Horsehead! Many extremely deep images show the faint nebulosity, but Integration Time goes from a couple of hours to 12 hours. As I live in one of the biggest cities in the world (Bortle Class 9), and I only travel to a dark site once in a month, I simply can't spend the whole night in only one single image. Moreover, with my mount (at that time - the EQ3-2), long unguided subs are simply impossible (something like 5minutes @ 200mm). The maximum sub I could get with the EQ3-2 is 60s or 1 minute. Finally, in that beautiful night last July, I imaged many targets, but with a longer integration per object (30 minutes), in comparison with my past images.

Now, with the Go-To HEQ5, I imagine I'll be able to get much longer subs, perhaps 180-300s unguided. As such, from now on, my astrophotography will contrate more effort in less images, with longer integration times: 40 to 60 minutes per image, and, for some of the best objects of the season (M42 in November, for example), up to 1.5-2h. But, this image shows that, for many purposes, hours of integrain aren't necessary for a great image, from a dark sky.

This image is a composite of 30x60s subs, total half a hour, and this is much less compared to other images. But you can actually make out the detail, the nebulosity and the beauty of this stunning nebulae in the data. It is a bit noisy, but I'm overall very happy with it.

Taken from Rural Skies (Bortle 3-4), from MG, Brazil. Thanks for seeing.

Camera: Unmodded T4i/650D at ISO 1600
Lens: Tamron 70-200mm f/2.8, at 200mm and f/3.2
Exposure Detail: 30x60s; or 30x1 minute; total 30 minutes.

Processing Note: I've used Google's Nix Collection Color Efex Pro in one of the versions

Comments

Author

grsotnas
Gabriel R. Santos...
License: None (All rights reserved)
6533
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The Blue Horsehead Nebula - IC 4592, 





    
        

            Gabriel R. Santos...